How to work with (display, format, restructure) big amount of structured data?

I’m really struggling to find out the best way (softwarely speaking) to work with big amounts of flexibly structured data, mostly text and some images(sections, chapters, etc. but that are movable).

I have thousands of pages on acting techniques. Presently, they're all in a Word document (sometimes, I like having big files because otherwise, I tend to duplicate data and get lost if I have to many loose files on the very same subject)… But using MS Word for huge files is just not very convenient (if not downright dangerous — “corruptionly” speaking. Although I've never experienced that...).

What I need is to be able to have:

- a unified view of all the data (one reason for that is that I want to be able to zoom out and see a lot of material at once, I want to be able to jump from page 1 to page 1052 in a second, etc.).
- an outlined view of the chapters, parts, sections, etc., (MS Word does that : Outline View, and Document Map)
- a very easy way to reorganize the order of the different sections,
- a file format that’s indexable (or a database that’s indexable – X1, Archivarius are the Desktop Search solutions I use -- It's just not a good way to use an internal searching engine, separate from the rest of my files!!!),
- an editing solution which allows the same kind of formatting ability, Bold, Italic, bullets, cross referencing, etc. that MS word, OpenOffice or any advanced word processor will provide (to me, formatting is not just fuss : it gives the document a hierarchical outline, makes it easier to read, find info... to me it's not just a matter of content first, form after...),
- the ability to access my data and READ it on an other computer relatively easily. (I might be willing to cede on that one though...)